許溝大(da)橋位(wei)于洛三高(gao)速公(gong)路(lu)k49+453.37~k49+946.51,三門峽義(yi)馬市近郊,該橋橋孔布置自東向西:9×20m+220m+4×20m,全(quan)長493.14m。由(you)中(zhong)鐵(tie)十一局集團第一工程有限公(gong)司施工建(jian)設。
該橋(qiao)(qiao)橋(qiao)(qiao)孔布置自東向(xiang)西:9×20m+220m+4×20m,全長(chang)493.14m。主孔為(wei)等截(jie)面(mian)(mian)懸(xuan)鏈線箱形無鉸拱,截(jie)面(mian)(mian)為(wei)三室箱,拱軸(zhou)系(xi)數m=1.543,凈(jing)跨(kua)徑(jing)L0=220m,凈(jing)矢高(gao)f0=40m,矢跨(kua)比f0/L0=1/5.5。拱上建筑為(wei)13-17.5m先張預應力混凝土空(kong)心板(ban)(ban)及雙柱式排架立柱,橋(qiao)(qiao)面(mian)(mian)連續(xu),柱間設橫(heng)向(xiang)聯系(xi)。東西引(yin)橋(qiao)(qiao)為(wei)20m預應力混凝土空(kong)心板(ban)(ban)梁,橋(qiao)(qiao)面(mian)(mian)連續(xu),下部為(wei)雙柱式墩(dun)臺,基(ji)礎(chu)為(wei)鉆孔灌注(zhu)嵌巖(yan)樁。
該橋橋寬為(wei)24m,分上(shang)、下行(xing),單(dan)幅(fu)橋寬為(wei)12m(11+2×0.5m墻式(shi)護欄)。設(she)計(ji)荷載為(wei):汽-超20,掛(gua)-120。主拱(gong)(gong)拱(gong)(gong)座(zuo)為(wei)重力式(shi)基(ji)礎,置于樁(zhuang)基(ji)或完(wan)整砂(sha)巖上(shang)。上(shang)下行(xing)之間(jian)設(she)3cm沉(chen)降(jiang)縫,每個拱(gong)(gong)座(zuo)混凝土(tu)量(liang)6000m以上(shang),屬大(da)體積混凝土(tu),采取基(ji)坑滿注(zhu),提(ti)高拱(gong)(gong)座(zuo)背后土(tu)抗(kang)力;主拱(gong)(gong)拱(gong)(gong)箱采用C50混凝土(tu)。上(shang)、下行(xing)拱(gong)(gong)圈之間(jian)為(wei)加強聯結,設(she)6處聯結系。
許溝(gou)(gou)大(da)橋位于洛三(san)高速公路(lu)k49+453.37~k49+946.51,三(san)門峽(xia)義(yi)馬市近郊,常窯水庫(ku)下游,跨越(yue)許溝(gou)(gou),溝(gou)(gou)中常年無水。溝(gou)(gou)槽內(nei)地勢較為(wei)平坦,表(biao)層(ceng)為(wei)亞砂(sha)(sha)土,下層(ceng)為(wei)卵(luan)石(shi)層(ceng);兩岸地質(zhi)較好,表(biao)層(ceng)有0~3m的沖積亞砂(sha)(sha)土和卵(luan)石(shi)層(ceng),下層(ceng)為(wei)泥質(zhi)粉砂(sha)(sha)與(yu)粉砂(sha)(sha)質(zhi)泥頁(ye)巖互層(ceng)。該地區最大(da)風力為(wei)20m/s,有霜(shuang)期為(wei)180~240天(tian)。